Katzenbach v. McClung involved a restaurant that served food to black customers only at take-out windows. White customers would be seated. The Department of Justice was able to successfully sue the restaurant for violation of the Civil Rights Act because:

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The key factor in Katzenbach v. McClung was that the restaurant purchased a significant amount of its food from out-of-state suppliers. This allowed the federal government to argue that the restaurant was engaged in interstate commerce, thus subjecting it to federal regulations such as the Civil Rights Act of 1964.

Katzenbach V